<template>
  <div class="bottom-bar">
    <div class="check-content">
      <check-button
        :is-checked="iSelectAll"
        class="check-button" @click.native="checkClick"/>
      <span>全选</span>

    </div>
    <div class="price">
      合计: {{totalPrice}}
    </div>

    <div class="calculate" @click="calcClick">
      去计算({{checkLength}})
    </div>

  </div>
</template>

<script>
  import CheckButton from "@/components/content/checkButton/CheckButton";

  import { mapGetters} from 'vuex'

  export default {
    name: "CartBottomBar",
    components: {
      CheckButton
    },
    computed: {
      ...mapGetters(['cartList']),
      totalPrice() {
        return '￥' + this.cartList.filter(item => {
          return item.checked
        }).reduce((preValue, item) => {
          return preValue + item.price * item.count
        }, 0).toFixed(2)
      },
      checkLength() {
        return this.cartList.filter(item => item.checked).length
      },
      iSelectAll() {
        //1.使用filter
        //if (this.cartList.length === 0) return false
        // return  !(this.cartList.filter(item => !item.checked).length)

        //2.使用find
        // if (this.cartList.length === 0) return false
        //  return !this.cartList.find( item => !item.checked)

        //3.普通遍历
        if (this.cartList.length === 0) return false
        for (let item of this.cartList ){
          if (!item.checked){
            return false
          }
        }
        return true

          }
    },
    methods: {
      checkClick(){
        if (this.iSelectAll){ //全部选中
          this.cartList.forEach(item => item.checked= false)
        }else {  //部分或全部不选中
          this.cartList.forEach(item => item.checked= true)

        }
      },
      calcClick(){
        if (! this.iSelectAll) {
          this.$toast.show('请选中购买的商品', 2000)

        }
      }
    }
      }
</script>

<style scoped>
  .bottom-bar {
    position: relative;
    display: flex;

    height: 40px;
    line-height: 40px;

    background-color: #eee;

    font-size: 14px;

  }

  .check-content {
    display: flex;
    align-items: center;
    margin-left: 10px;
    width: 60px;
  }

  .check-button{
    width: 20px;
    height: 20px;
    line-height: 20px;
    margin-right: 5px;
  }
  .price{
    margin-left: 20px;
    flex: 1;
  }

  .calculate{
    width: 90px;
    background: red;
    color: #fff;
    text-align: center;

  }


</style>
